Understanding Pregnancy Prevention After a Single Sexual Encounter

Question
if me and my gilrfriend have sex just for one night, what should she use to avoid pregnancy? and I would wear the condom.

Answer
John,

You can't really avoid pregnancy 100%. She could get pregnant in just one time of sex, even with the condom. So I wouldn't recommend you to have sex. Wait until you are married and not worried about pregnancy or sexually transmitted diseases. Condoms are not safe from pregnancy or STDs.
Please avoid sex before marriage.

Diane W.